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Calculated Energies of Hydrogen Bonds

B3LYP/6-31G*

Dimer H Donor H Acceptor comment
HCOOHH2O Formic acid water dimer HCOOH Formic acid H2O Water

Energy components

Dimer Donor Acceptor difference
Energy (hartrees) -266.188728 -189.747171 -76.408954 0.032603 85.6  kJ mol-1
Vibrational zero point energy (cm-1) 12628 7068 4462 -1098 -13.1  kJ mol-1
Total         72.5  kJ mol-1